Funding for this research was provided by:
Korea Health Industry Development Institute (HI16C1984)
Ministry of Science, ICT and Future Planning (2019R1A2C2002390, 2016R1D1A1B03931270, 2017R1D1A1B03027897)
Text and Data Mining valid from 2020-01-06
Received: 3 September 2019
Accepted: 1 November 2019
First Online: 6 January 2020
Ethics approval and consent to participate
: Not applicable.
: The authors declare that they have no competing interests.